Building a Lego-powered Submarine 2.0 - magnetic couplings

This RC sub has magnetic couplings to transmit torque through the walls. No need to drill holes = no leaks. At the end I test it in a swimming pool. Enjoy! Differences to the first sub -rectangular hull (need flat walls for magnetic couplings) -snap-and-lock lid (more reliable, less leakage) -bigger motors, more motors, more propellers -depth control using propellers (IMO more accurate compared to a syringe ballast tank) -lead pellets for ballast (easier to adjust, both shape and weight, compared to steel plates) -captain (thanks everyone for pointing out this obvious missing part :)) The submarine specs: Displacement: 2.7 kg (6.0 lb) Test depth: 1.5 m (4.9 ft) Hull: glass food container (IKEA 365 ), plastic lid Motors: 3x Lego XL-motor (8882-1) Magnetic couplings: K&J Magnetics R844-N52 neodymium magnet, TapeCase 423-5 UHMW Tape Propellers: Lego propeller blade (2952), Lego liftarms Radio control: 27